JPS6340013A - Foundation pile for relieving negative frictional force - Google Patents
Foundation pile for relieving negative frictional forceInfo
- Publication number
- JPS6340013A JPS6340013A JP18231086A JP18231086A JPS6340013A JP S6340013 A JPS6340013 A JP S6340013A JP 18231086 A JP18231086 A JP 18231086A JP 18231086 A JP18231086 A JP 18231086A JP S6340013 A JPS6340013 A JP S6340013A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- cloth
- foundation pile
- polyurethane resin
- covering material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 claims abstract description 21
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 20
- 239000011241 protective layer Substances 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims abstract description 19
- 239000004744 fabric Substances 0.000 claims abstract description 14
- 239000003190 viscoelastic substance Substances 0.000 claims abstract description 13
- 229940006076 viscoelastic substance Drugs 0.000 claims abstract description 6
- 239000011521 glass Substances 0.000 claims abstract description 5
- 229920002978 Vinylon Polymers 0.000 claims abstract description 4
- 240000000491 Corchorus aestuans Species 0.000 claims abstract description 3
- 235000011777 Corchorus aestuans Nutrition 0.000 claims abstract description 3
- 235000010862 Corchorus capsularis Nutrition 0.000 claims abstract description 3
- 239000004677 Nylon Substances 0.000 claims abstract description 3
- 229920001778 nylon Polymers 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 19
- 239000010959 steel Substances 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 6
- 238000003860 storage Methods 0.000 abstract description 5
- 239000002759 woven fabric Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- IDCBOTIENDVCBQ-UHFFFAOYSA-N TEPP Chemical compound CCOP(=O)(OCC)OP(=O)(OCC)OCC IDCBOTIENDVCBQ-UHFFFAOYSA-N 0.000 abstract 1
- -1 polyethylene Polymers 0.000 description 12
- 239000011247 coating layer Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 229920005862 polyol Polymers 0.000 description 6
- 239000012791 sliding layer Substances 0.000 description 6
- 229920003002 synthetic resin Polymers 0.000 description 6
- 239000000057 synthetic resin Substances 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 3
- 239000005056 polyisocyanate Substances 0.000 description 3
- 229920001228 polyisocyanate Polymers 0.000 description 3
- 150000003077 polyols Chemical class 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
Description
【発明の詳細な説明】
工１上立札工分立
本発明は軟弱地盤で使用する負摩擦力軽減用基礎杭に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foundation pile for reducing negative friction force used in soft ground.
従ｍ支訴
軟弱な地盤、例えば粘土層、泥炭層の上に建造物を構築
しなければならない場合、一般に垂直な基礎部材、例え
ばコンクリートまたは鋼管の基礎杭が適用される。これ
らの基礎部材の先端は支持層の上に置かれ、一方、ある
場合には、これに加えて建造物の重量の一部は軟弱な土
層によって支持されている。すなわち、土層が充分に沈
下圧密されていれば、基礎杭の周面摩擦力は先端の支持
力とともに建造物の重量すなわち荷重の吸収にあずかる
。しかし、地盤が沈下、圧密の過程にあり、杭の打設後
もこれが進行している場合には下方への周面摩擦力、す
なわち負の摩擦力を生じ、基礎杭の支持力を著しく低下
させるために杭の沈下もしくは座屈が誘発される。If a building has to be constructed on soft ground, for example a clay layer, a peat layer, vertical foundation members, for example concrete or steel pipe foundation piles, are generally applied. The tips of these foundation members rest on a support layer, while in some cases additionally part of the weight of the structure is supported by a soft soil layer. In other words, if the soil layer is sufficiently settled and consolidated, the peripheral surface friction force of the foundation pile will absorb the weight of the building, that is, the load, along with the supporting force at the tip. However, if the ground is in the process of subsidence and consolidation, and this continues even after the piles are driven, a downward circumferential surface friction force, that is, a negative friction force is generated, which significantly reduces the supporting capacity of the foundation pile. This induces sinking or buckling of the pile.
従来、このような負の摩擦力を軽減するための基礎杭の
例として、基礎杭の外周面にビチューメンからなる被覆
層を塗布形成したもの（特公昭５６−４６０１２号）、
鋼管抗体の外周面にビチューメンのごとき粘弾性物質か
らなるすべり層を形成し、さらにその表面に合成樹脂の
シートの外層被覆を施した被覆層（実公昭５３−２１８
４１および実公昭５６−４３５９７）が知られている。Conventionally, examples of foundation piles for reducing such negative frictional forces include those in which a coating layer made of bitumen is applied to the outer peripheral surface of the foundation pile (Japanese Patent Publication No. 56-46012);
A slip layer made of a viscoelastic material such as bitumen is formed on the outer peripheral surface of a steel pipe body, and the surface is further coated with an outer layer of a synthetic resin sheet.
41 and Utility Model Publication No. 56-43597) are known.
■が”ンしよ゛と るい−占
しかしながら、前者は夏季保管時に粘弾性物質が軟化し
て運搬が困難であるとか、打込み時にすべり層が剥離し
たり、土や石が食い込むなどの欠点がある。後者は前者
の欠点を改良したものであるが、工場生産時の合成樹脂
被覆層の硬化あるいは冷却固化時の収縮により被覆層に
凹凸を生じる、夏季屋外保管時に粘弾性物質が軟化して
合成樹脂被覆層に変形、クランク、剥離、ふくれ等を生
じるなどの欠点がある。これらは、軟化点が低く針入度
が高い粘弾性物質を使用し、かつ合成樹脂の厚みが薄い
か合成樹脂としてクロスへラドダイにより押出被覆した
熱可塑性樹脂を使用した場合に顕著である。However, the former has drawbacks such as the viscoelastic material softening during summer storage and being difficult to transport, the slip layer peeling off during driving, and soil and stones digging into it. The latter improves the drawbacks of the former, but the coating layer becomes uneven due to hardening of the synthetic resin coating layer during factory production or shrinkage during cooling and solidification, and the viscoelastic material softens during outdoor storage in summer. The synthetic resin coating layer has drawbacks such as deformation, cranking, peeling, blistering, etc. These problems are caused by using a viscoelastic material with a low softening point and high penetration, and by using a thin synthetic resin or by using a synthetic resin. This is particularly noticeable when using a thermoplastic resin coated by extrusion with a rad die.
本発明は、上記欠点を解決した負摩擦力軽減用基礎杭で
あり、夏季保管時に被覆層に凹凸を生じず、粘弾性物質
が軟化して合成樹脂被覆層に変形、クランク、剥離、ふ
くれ等が生じず、かつ負摩擦力に対してすべり性能の優
れた被覆基礎杭を提供することを目的とするものである
。The present invention is a foundation pile for reducing negative frictional force that solves the above-mentioned drawbacks, and does not cause unevenness in the coating layer during summer storage, and the viscoelastic material softens and deforms into the synthetic resin coating layer, causing problems such as cracking, peeling, blistering, etc. The purpose of the present invention is to provide a coated foundation pile that does not cause friction and has excellent sliding performance against negative frictional forces.
口ｐ占 ７′° るための
本発明者らは上記欠点を解決するために鋭意研究を重ね
た結果、ポリウレタン樹脂を含浸した織布状覆装材を負
摩擦力軽減用の基礎杭のすべり層の保護被覆として使用
することにより上記の欠点を解決した本発明を提供する
に至ったものである。As a result of extensive research to solve the above-mentioned drawbacks, the inventors of the present invention found that a woven covering material impregnated with polyurethane resin was used to reduce the slippage of foundation piles to reduce negative frictional force. The present invention has been provided, which solves the above-mentioned drawbacks by using it as a protective coating for layers.
すなわち、抗体の外周面に粘弾性物質からなるすべり層
を形成し、さらにその外表面に保護層を形成した抗体に
おいて、
保護層としてポリレタン樹脂を含浸した織布状覆装材を
被覆した負摩擦力軽減用基礎杭である。In other words, in an antibody in which a sliding layer made of a viscoelastic substance is formed on the outer peripheral surface of the antibody, and a protective layer is further formed on the outer surface of the antibody, negative friction is obtained by covering the antibody with a woven covering material impregnated with polyurethane resin as the protective layer. This is a foundation pile for force reduction.
以下本発明の基礎杭について、図面に基づいて詳細に説
明する。１は基礎杭、２は粘弾性物質からなるすべり層
、３は保護層中における織布状覆装材被覆層、４はポリ
ウレタン樹脂保護層である。The foundation pile of the present invention will be explained in detail below based on the drawings. 1 is a foundation pile, 2 is a sliding layer made of a viscoelastic substance, 3 is a woven fabric covering material covering layer in the protective layer, and 4 is a polyurethane resin protective layer.
本発明の基礎杭としては一般に鋼管杭、Ｈ型鋼、■型鋼
、コンクリート杭等が使用されるが、特に限定するもの
ではなく、軟弱地盤で使用される杭全般に通用が可能で
ある。鋼管杭の場合には保護層としてポリエチレンを使
用した基礎杭があるが、前記のような問題点がある。Ｈ
型鋼、■型鋼を基礎杭として使用する場合にはポリエチ
レンの貼り付けが困難である。たとえ貼り付けても冷却
固化するときのポリエチレンの収縮により、はがれてし
まうので基礎杭としては使用不可能である。本発明では
ポリウレタン樹脂を使用しているために硬化時の保護層
の収縮は少なくＨ型鋼、■型鋼のような形状の基礎杭に
対してもすべり層の保護の目的に使用可能である。As the foundation pile of the present invention, steel pipe piles, H-shaped steel, ■-shaped steel, concrete piles, etc. are generally used, but there are no particular limitations, and any pile used in soft ground can be used. In the case of steel pipe piles, there are foundation piles that use polyethylene as a protective layer, but these have the problems described above. H
When using shaped steel or type steel as foundation piles, it is difficult to attach polyethylene. Even if it is pasted, it cannot be used as a foundation pile because it will peel off due to the shrinkage of the polyethylene as it cools and hardens. In the present invention, since polyurethane resin is used, the protective layer shrinks little during hardening, and can be used for the purpose of protecting the sliding layer even for foundation piles in shapes such as H-shaped steel and ■-shaped steel.
本発明の織布状覆装材としては、ビニロンクロス、ガラ
スクロス、ヘソシャクロス、ナイロンクロス、ガラスマ
ット、ジュート、布等が使用されるが、目的にかない、
ポリウレタン樹脂の硬化に有害でないものであれば他の
材料も使用できる。As the woven covering material of the present invention, vinylon cloth, glass cloth, hesosha cloth, nylon cloth, glass mat, jute, cloth, etc. are used, but depending on the purpose,
Other materials can be used as long as they are not detrimental to the curing of the polyurethane resin.
該織布状覆装材は基礎杭に対してスパイラル状に巻くも
のである。織布状覆装材の密度は５〜５０本／２本能２
５龍が最適である。密度が５本より小さいときは保護層
の強度が弱（なり、吊下げのときに保護層が破断したり
、段積みのときにすべり層が変形しやすい。また密度が
５０本より大きいときは、織布状覆装材中にポリウレタ
ン樹脂が含浸しにくく、ポリウレタン樹脂の密着に難点
がある。このために、覆装材中に気泡が残るので、夏季
屋外保管時に保護層のふくれがおこりやすくなる。この
ように織布状覆装材の密度はポリウレタン樹脂の接着と
保護層としての強度の観点から５〜５０本／２５■ｌと
するのが最適である。The woven covering material is wound in a spiral around the foundation pile. The density of the woven covering material is 5 to 50 pieces/2 Instinct 2
5 dragons is optimal. When the density is less than 5, the strength of the protective layer is weak (and the protective layer is likely to break when hanging, and the sliding layer is easily deformed when stacked. Also, when the density is more than 50, It is difficult for the polyurethane resin to be impregnated into the woven covering material, making it difficult for the polyurethane resin to adhere well.As a result, air bubbles remain in the covering material, making the protective layer prone to blistering when stored outdoors in the summer. Thus, from the viewpoint of adhesion of the polyurethane resin and strength as a protective layer, the optimal density of the woven covering material is 5 to 50 fibers/25 liters.
本発明のポリウレタン樹脂としては、一般に水酸基を２
個以上有する化合物とイソシアネート基を２個以上有す
る化合物とを反応して得られるものが使用される。水酸
基を２個以上有する化合物としては、ポリオキシプロピ
レンポリオール、ポリテトラメチレングリコールなどの
ポリエーテルポリオール、ポリニレチンアジペート、ポ
リブチレンアジペートなどのポリエステルポリオール、
ポリブタジェンポリオール、ヒマシ油などが使用できる
。また、イソシアネート基を２個以上有する化合物とし
ては、トリレンジイソシアネート、ジフェニルメタンジ
イソシアネート、ポリフェニレンポリメチレンポリイソ
シアネート、ヘキサメチレンジイソシアネート、キシリ
レンジイソシアネートなどが使用できる。The polyurethane resin of the present invention generally has 2 hydroxyl groups.
A compound obtained by reacting a compound having two or more isocyanate groups with a compound having two or more isocyanate groups is used. Compounds having two or more hydroxyl groups include polyether polyols such as polyoxypropylene polyol and polytetramethylene glycol, polyester polyols such as polynyletine adipate and polybutylene adipate,
Polybutadiene polyol, castor oil, etc. can be used. Further, as the compound having two or more isocyanate groups, tolylene diisocyanate, diphenylmethane diisocyanate, polyphenylene polymethylene polyisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, etc. can be used.
これらのポリオール化合物とポイソシアネート化合物か
らポリウレタン樹脂を得るには、ポリオール化合物の混
合液とポリイソシアネート化合物を混合すると同時に硬
化するワンショット法、ポリオール化合物の一部とポリ
イソシアネート化合物をあらかじめ反応した液にポリオ
ール化合物を混合して硬化するプレポリマー法等がある
。本発明においては両方の方法が適用できる。To obtain a polyurethane resin from these polyol compounds and polyisocyanate compounds, there are two methods: one-shot method, in which a mixed solution of polyol compound and polyisocyanate compound are mixed and simultaneously cured; There is a prepolymer method in which a polyol compound is mixed and cured. Both methods are applicable in the present invention.
織布状覆装材はポリウレタン樹脂で含浸されており、織
布状覆装材の上層のポリウレタン樹脂と下層のポリウレ
タン樹脂は強固に接着されている。The woven covering material is impregnated with polyurethane resin, and the polyurethane resin in the upper layer and the polyurethane resin in the lower layer of the woven covering material are firmly adhered.
また織布状覆装材をポリウレタン樹脂で含浸するときに
は、有害な気泡を巻込まないようにすることが必要であ
る。Furthermore, when impregnating the woven covering material with polyurethane resin, it is necessary to avoid entrainment of harmful air bubbles.
本発明の織布状覆装材を含んだポリウレタン樹脂保護層
の厚さは、０．５ ａｍ〜５ｗが適切である。The appropriate thickness of the polyurethane resin protective layer containing the woven covering material of the present invention is 0.5 am to 5w.
保護層の厚さがＱ、５ ａｍより薄いときは、基礎杭を
段積みしたときにすべり層が変形したり、吊下げたとき
に保護層に切断がおこりやすい。また、保護層の厚さが
５鰭より厚い場合には上記のような欠点はないが、経済
性の点から不利である。When the thickness of the protective layer is thinner than Q, 5 am, the sliding layer is likely to be deformed when the foundation piles are stacked, or the protective layer is likely to be cut when suspended. Further, when the thickness of the protective layer is thicker than five fins, there is no disadvantage as mentioned above, but it is disadvantageous from an economic point of view.
発ユ■立来
以上のように、本発明による基礎杭は、生産時、屋外保
管時、打込み時のそれぞれにおいて優れた特性を発揮す
るという優れた利点がある。As described above, the foundation pile according to the present invention has the excellent advantage of exhibiting excellent characteristics during production, outdoor storage, and driving.
次に本発明を実施例と比較例により具体的に示すが、本
発明の範囲はこれらの実施例に限定するものではないこ
とはいうまでもない。Next, the present invention will be specifically illustrated by Examples and Comparative Examples, but it goes without saying that the scope of the present invention is not limited to these Examples.
実施例
外形１０００ｍｍ、長さ５ｍの鋼管杭に軟化点６０゛Ｃ
１針大度１００のアスファルト系の粘弾性物質を厚さ３
顛に均一塗布してすべり層を形成させた後、第１表に示
す保護層を施した。夏季に屋外ｔｌＷｉ７ｇを実施した
のち、杭の先端に鋼製の保護リングを取付けて地盤沈下
の大きいく沈下速度２０ｃｍ／年）地盤に打込んだ後、
引抜いて被覆表面を観察した。この結果、本発明による
実施例１〜４においては、屋外温度２３〜３５℃、鋼管
表面温度２５〜６０℃の状態で６０日問屋外保管した後
表面状態を観察したところ凹凸、クランク、ふくれの発
生は見られなかった。Softening point 60°C for steel pipe piles of 1000mm and 5m length
One needle is made of asphalt-based viscoelastic material with a diameter of 100 and a thickness of 3
After uniformly coating the fabric to form a slipping layer, the protective layer shown in Table 1 was applied. After carrying out outdoor tlWi7g in the summer, a steel protection ring was attached to the tip of the pile and it was driven into the ground (sinking rate 20cm/year), where the ground subsidence was large.
It was pulled out and the coated surface was observed. As a result, in Examples 1 to 4 according to the present invention, the surface condition was observed after being stored outdoors for 60 days at an outdoor temperature of 23 to 35 °C and a steel pipe surface temperature of 25 to 60 °C. No outbreak was observed.
比較例１では雨の降った翌日に晴天になって鋼管温度が
上昇したために、被覆層表面においてふくれの発生が見
られた。比較例２では粘弾性物質の流動により被覆層表
面に凹凸、変形が見られた。In Comparative Example 1, the weather became sunny the day after it rained and the temperature of the steel pipe increased, so blistering was observed on the surface of the coating layer. In Comparative Example 2, irregularities and deformation were observed on the surface of the coating layer due to the flow of the viscoelastic substance.
比較例３では粘弾性物質の軟化流動とポリエチレンの残
留応力で表面の凹凸が発生した。In Comparative Example 3, surface irregularities occurred due to softening flow of the viscoelastic material and residual stress of the polyethylene.
打込み引抜き後の被覆層表面は実施例および比較例３で
は被覆層表面に微小なすり傷があるだけで、被覆層の破
れやめくれは認められなかった。In Example and Comparative Example 3, the surface of the coating layer after being driven and pulled out had only minute scratches on the surface of the coating layer, and no tearing or curling of the coating layer was observed.
比較例１ではふくれの発生した部分が打込み中に破れて
いた。比較例２では打込み中および引抜き中に端部から
保護層のめくれが発生した。In Comparative Example 1, the blistered portion was torn during driving. In Comparative Example 2, the protective layer peeled off from the edges during driving and drawing.
（以下余白）(Margin below)
第１図は本発明によって被覆した鋼管基礎杭の一部断面
図である。
１は鋼管杭、２はすべり層、３は織布状覆装材、４はポ
リウレタン樹脂保護層である。
特許出願人 第−工業製薬株式会社第１図FIG. 1 is a partial cross-sectional view of a steel pipe foundation pile coated according to the present invention. 1 is a steel pipe pile, 2 is a sliding layer, 3 is a woven fabric covering material, and 4 is a polyurethane resin protective layer. Patent applicant No. - Kogyo Seiyaku Co., Ltd. Figure 1
Claims (2)
成し、さらにその外表面に保護層を形成した抗体におい
て、 保護層として、ポリウレタン樹脂を含浸した織布状覆装
材を被覆したことを特徴とする負摩擦力軽減用基礎杭。(1) In an antibody in which a slippery layer made of a viscoelastic substance is formed on the outer peripheral surface of the antibody, and a protective layer is further formed on the outer surface of the antibody, a woven cloth-like covering material impregnated with polyurethane resin is used as the protective layer. A foundation pile for reducing negative frictional force characterized by being coated.
ヘッシャクロス、テトロンクロス、ナイロンクロス、ガ
ラスマット、ジュート、布等の織布状覆装材であること
を特徴とする特許請求の範囲第１項記載の負摩擦力軽減
用基礎杭。(2) The woven covering material is vinylon cloth, glass cloth,
The foundation pile for reducing negative frictional force according to claim 1, characterized in that it is a woven covering material such as Hesha cloth, Tetoron cloth, nylon cloth, glass mat, jute, cloth, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18231086A JPS6340013A (en) | 1986-08-01 | 1986-08-01 | Foundation pile for relieving negative frictional force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18231086A JPS6340013A (en) | 1986-08-01 | 1986-08-01 | Foundation pile for relieving negative frictional force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6340013A true JPS6340013A (en) | 1988-02-20 |
Family
ID=16116060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18231086A Pending JPS6340013A (en) | 1986-08-01 | 1986-08-01 | Foundation pile for relieving negative frictional force |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6340013A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6078294A (en) * | 1996-03-01 | 2000-06-20 | Toyota Jidosha Kabushiki Kaisha | Antenna device for vehicles |
-
1986
- 1986-08-01 JP JP18231086A patent/JPS6340013A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6078294A (en) * | 1996-03-01 | 2000-06-20 | Toyota Jidosha Kabushiki Kaisha | Antenna device for vehicles |
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